The aid packages, which come as US Defense Secretary Lloyd Austin is meeting with allies in Brussels, could be split into two categories: transfer of excess defense articles from U.S. stocks and other weapons being funded by the Ukraine Security Assistance Initiative (USAI), a separate congressionally authorized program.
Three sources familiar with the details, who spoke on condition of anonymity, said that one package of about $350 billion was expected to include more rockets for Multiple Launch Rocket Systems (MLRS) that had been sent to Ukraine and artillery rounds for M777 howitzers and spare parts.
A second package, anticipated to amount to more than $650 million and funded using USAI, could include ground-based Harpoon anti-ship missile launchers, secure radios, night vision and training.
Russia's UN ambassador Vassily Nebenzia on Wednesday accused Western countries of "fighting a proxy war with Russia," telling reporters: "I would like to say to the Western countries supplying weaponry to Ukraine – the blood of civilians is on your hands."
Ukraine is pressing the United States and other Western nations for speedy deliveries of weapons in the face of increased pressure from Russian forces in the eastern Donbass region.
Oleksandra Ustinova a member of the Ukrainian Parliament told reporters at an event organized by the German Marshall Fund: "We need all these weapons to be concentrated in a moment to defeat the Russians, not just keep coming every two or three weeks."
In May, the Biden administration announced a plan to give Ukraine M142 High Mobility Artillery Rocket Systems after receiving assurances from Kyiv that it would not use them to hit targets inside Russian territory. Biden imposed the condition to try to avoid escalating the Ukraine war. Read full story
The rocket artillery in this aid package would have the same range as previous US rocket shipments and would be funded using Presidential Drawdown Authority, or PDA, in which the president can authorize the transfer of articles and services from US stocks without congressional approval in response to an emergency, one of the source said.
For the first, the United States is considering sending the ground-based Harpoon launchers. In May, Reuters reported the US was working on potential solutions that included pulling a launcher off of a US ship to help provide Harpoon missile launch capability to Ukraine.
Harpoons made by Boeing Co cost about $1.5 million per missile, according to experts and industry executives.